Mercurial > hg > graal-jvmci-8
annotate src/share/vm/runtime/thread.hpp @ 3979:4dfb2df418f2
6484982: G1: process references during evacuation pauses
Summary: G1 now uses two reference processors - one is used by concurrent marking and the other is used by STW GCs (both full and incremental evacuation pauses). In an evacuation pause, the reference processor is embedded into the closures used to scan objects. Doing so causes causes reference objects to be 'discovered' by the reference processor. At the end of the evacuation pause, these discovered reference objects are processed - preserving (and copying) referent objects (and their reachable graphs) as appropriate.
Reviewed-by: ysr, jwilhelm, brutisso, stefank, tonyp
| author | johnc |
|---|---|
| date | Thu, 22 Sep 2011 10:57:37 -0700 |
| parents | 7588156f5cf9 |
| children | f08d439fab8c |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_RUNTIME_THREAD_HPP |
| 26 #define SHARE_VM_RUNTIME_THREAD_HPP | |
| 27 | |
| 28 #include "memory/allocation.hpp" | |
| 29 #include "memory/threadLocalAllocBuffer.hpp" | |
| 30 #include "oops/oop.hpp" | |
| 31 #include "prims/jni.h" | |
| 32 #include "prims/jvmtiExport.hpp" | |
| 33 #include "runtime/frame.hpp" | |
| 34 #include "runtime/javaFrameAnchor.hpp" | |
| 35 #include "runtime/jniHandles.hpp" | |
| 36 #include "runtime/mutexLocker.hpp" | |
| 37 #include "runtime/os.hpp" | |
| 38 #include "runtime/osThread.hpp" | |
| 39 #include "runtime/park.hpp" | |
| 40 #include "runtime/safepoint.hpp" | |
| 41 #include "runtime/stubRoutines.hpp" | |
| 42 #include "runtime/threadLocalStorage.hpp" | |
| 43 #include "runtime/unhandledOops.hpp" | |
| 44 #include "utilities/exceptions.hpp" | |
| 45 #include "utilities/top.hpp" | |
| 46 #ifndef SERIALGC | |
| 47 #include "gc_implementation/g1/dirtyCardQueue.hpp" | |
| 48 #include "gc_implementation/g1/satbQueue.hpp" | |
| 49 #endif | |
| 50 #ifdef ZERO | |
| 51 #ifdef TARGET_ARCH_zero | |
| 52 # include "stack_zero.hpp" | |
| 53 #endif | |
| 54 #endif | |
| 55 | |
| 0 | 56 class ThreadSafepointState; |
| 57 class ThreadProfiler; | |
| 58 | |
| 59 class JvmtiThreadState; | |
| 60 class JvmtiGetLoadedClassesClosure; | |
| 61 class ThreadStatistics; | |
| 62 class ConcurrentLocksDump; | |
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63 class ParkEvent; |
| 1878 | 64 class Parker; |
| 0 | 65 |
| 66 class ciEnv; | |
| 67 class CompileThread; | |
| 68 class CompileLog; | |
| 69 class CompileTask; | |
| 70 class CompileQueue; | |
| 71 class CompilerCounters; | |
| 72 class vframeArray; | |
| 73 | |
| 74 class DeoptResourceMark; | |
| 75 class jvmtiDeferredLocalVariableSet; | |
| 76 | |
| 77 class GCTaskQueue; | |
| 78 class ThreadClosure; | |
| 79 class IdealGraphPrinter; | |
| 80 | |
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81 class WorkerThread; |
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82 |
| 0 | 83 // Class hierarchy |
| 84 // - Thread | |
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85 // - NamedThread |
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86 // - VMThread |
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87 // - ConcurrentGCThread |
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88 // - WorkerThread |
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89 // - GangWorker |
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90 // - GCTaskThread |
| 0 | 91 // - JavaThread |
| 92 // - WatcherThread | |
| 93 | |
| 94 class Thread: public ThreadShadow { | |
| 95 friend class VMStructs; | |
| 96 private: | |
| 97 // Exception handling | |
| 98 // (Note: _pending_exception and friends are in ThreadShadow) | |
| 99 //oop _pending_exception; // pending exception for current thread | |
| 100 // const char* _exception_file; // file information for exception (debugging only) | |
| 101 // int _exception_line; // line information for exception (debugging only) | |
| 102 | |
| 103 // Support for forcing alignment of thread objects for biased locking | |
| 104 void* _real_malloc_address; | |
| 105 public: | |
| 106 void* operator new(size_t size); | |
| 107 void operator delete(void* p); | |
| 108 private: | |
| 109 | |
| 110 // *************************************************************** | |
| 111 // Suspend and resume support | |
| 112 // *************************************************************** | |
| 113 // | |
| 114 // VM suspend/resume no longer exists - it was once used for various | |
| 115 // things including safepoints but was deprecated and finally removed | |
| 116 // in Java 7. Because VM suspension was considered "internal" Java-level | |
| 117 // suspension was considered "external", and this legacy naming scheme | |
| 118 // remains. | |
| 119 // | |
| 120 // External suspend/resume requests come from JVM_SuspendThread, | |
| 121 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI | |
| 122 // ResumeThread. External | |
| 123 // suspend requests cause _external_suspend to be set and external | |
| 124 // resume requests cause _external_suspend to be cleared. | |
| 125 // External suspend requests do not nest on top of other external | |
| 126 // suspend requests. The higher level APIs reject suspend requests | |
| 127 // for already suspended threads. | |
| 128 // | |
| 129 // The external_suspend | |
| 130 // flag is checked by has_special_runtime_exit_condition() and java thread | |
| 131 // will self-suspend when handle_special_runtime_exit_condition() is | |
| 132 // called. Most uses of the _thread_blocked state in JavaThreads are | |
| 133 // considered the same as being externally suspended; if the blocking | |
| 134 // condition lifts, the JavaThread will self-suspend. Other places | |
| 135 // where VM checks for external_suspend include: | |
| 136 // + mutex granting (do not enter monitors when thread is suspended) | |
| 137 // + state transitions from _thread_in_native | |
| 138 // | |
| 139 // In general, java_suspend() does not wait for an external suspend | |
| 140 // request to complete. When it returns, the only guarantee is that | |
| 141 // the _external_suspend field is true. | |
| 142 // | |
| 143 // wait_for_ext_suspend_completion() is used to wait for an external | |
| 144 // suspend request to complete. External suspend requests are usually | |
| 145 // followed by some other interface call that requires the thread to | |
| 146 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into | |
| 147 // the interface that requires quiescence, we give the JavaThread a | |
| 148 // chance to self-suspend before we need it to be quiescent. This | |
| 149 // improves overall suspend/query performance. | |
| 150 // | |
| 151 // _suspend_flags controls the behavior of java_ suspend/resume. | |
| 152 // It must be set under the protection of SR_lock. Read from the flag is | |
| 153 // OK without SR_lock as long as the value is only used as a hint. | |
| 154 // (e.g., check _external_suspend first without lock and then recheck | |
| 155 // inside SR_lock and finish the suspension) | |
| 156 // | |
| 157 // _suspend_flags is also overloaded for other "special conditions" so | |
| 158 // that a single check indicates whether any special action is needed | |
| 159 // eg. for async exceptions. | |
| 160 // ------------------------------------------------------------------- | |
| 161 // Notes: | |
| 162 // 1. The suspend/resume logic no longer uses ThreadState in OSThread | |
| 163 // but we still update its value to keep other part of the system (mainly | |
| 164 // JVMTI) happy. ThreadState is legacy code (see notes in | |
| 165 // osThread.hpp). | |
| 166 // | |
| 167 // 2. It would be more natural if set_external_suspend() is private and | |
| 168 // part of java_suspend(), but that probably would affect the suspend/query | |
| 169 // performance. Need more investigation on this. | |
| 170 // | |
| 171 | |
| 172 // suspend/resume lock: used for self-suspend | |
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173 Monitor* _SR_lock; |
| 0 | 174 |
| 175 protected: | |
| 176 enum SuspendFlags { | |
| 177 // NOTE: avoid using the sign-bit as cc generates different test code | |
| 178 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 | |
| 179 | |
| 180 _external_suspend = 0x20000000U, // thread is asked to self suspend | |
| 181 _ext_suspended = 0x40000000U, // thread has self-suspended | |
| 182 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt | |
| 183 | |
| 184 _has_async_exception = 0x00000001U // there is a pending async exception | |
| 185 }; | |
| 186 | |
| 187 // various suspension related flags - atomically updated | |
| 188 // overloaded for async exception checking in check_special_condition_for_native_trans. | |
| 189 volatile uint32_t _suspend_flags; | |
| 190 | |
| 191 private: | |
| 192 int _num_nested_signal; | |
| 193 | |
| 194 public: | |
| 195 void enter_signal_handler() { _num_nested_signal++; } | |
| 196 void leave_signal_handler() { _num_nested_signal--; } | |
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197 bool is_inside_signal_handler() const { return _num_nested_signal > 0; } |
| 0 | 198 |
| 199 private: | |
| 200 // Debug tracing | |
| 201 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN; | |
| 202 | |
| 203 // Active_handles points to a block of handles | |
| 204 JNIHandleBlock* _active_handles; | |
| 205 | |
| 206 // One-element thread local free list | |
| 207 JNIHandleBlock* _free_handle_block; | |
| 208 | |
| 209 // Point to the last handle mark | |
| 210 HandleMark* _last_handle_mark; | |
| 211 | |
| 212 // The parity of the last strong_roots iteration in which this thread was | |
| 213 // claimed as a task. | |
| 214 jint _oops_do_parity; | |
| 215 | |
| 216 public: | |
| 217 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } | |
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218 HandleMark* last_handle_mark() const { return _last_handle_mark; } |
| 0 | 219 private: |
| 220 | |
| 221 // debug support for checking if code does allow safepoints or not | |
| 222 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on | |
| 223 // mutex, or blocking on an object synchronizer (Java locking). | |
| 224 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases | |
| 225 // If !allow_allocation(), then an assertion failure will happen during allocation | |
| 226 // (Hence, !allow_safepoint() => !allow_allocation()). | |
| 227 // | |
| 228 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters. | |
| 229 // | |
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230 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen |
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231 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. |
| 0 | 232 |
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233 // Used by SkipGCALot class. |
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234 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? |
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235 |
| 0 | 236 // Record when GC is locked out via the GC_locker mechanism |
| 237 CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;) | |
| 238 | |
| 239 friend class No_Alloc_Verifier; | |
| 240 friend class No_Safepoint_Verifier; | |
| 241 friend class Pause_No_Safepoint_Verifier; | |
| 242 friend class ThreadLocalStorage; | |
| 243 friend class GC_locker; | |
| 244 | |
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245 ThreadLocalAllocBuffer _tlab; // Thread-local eden |
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246 jlong _allocated_bytes; // Cumulative number of bytes allocated on |
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247 // the Java heap |
| 0 | 248 |
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249 int _vm_operation_started_count; // VM_Operation support |
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250 int _vm_operation_completed_count; // VM_Operation support |
| 0 | 251 |
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252 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread |
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253 // is waiting to lock |
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254 bool _current_pending_monitor_is_from_java; // locking is from Java code |
| 0 | 255 |
| 256 // ObjectMonitor on which this thread called Object.wait() | |
| 257 ObjectMonitor* _current_waiting_monitor; | |
| 258 | |
| 259 // Private thread-local objectmonitor list - a simple cache organized as a SLL. | |
| 260 public: | |
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261 ObjectMonitor* omFreeList; |
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262 int omFreeCount; // length of omFreeList |
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263 int omFreeProvision; // reload chunk size |
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264 ObjectMonitor* omInUseList; // SLL to track monitors in circulation |
| 1587 | 265 int omInUseCount; // length of omInUseList |
| 0 | 266 |
| 267 public: | |
| 268 enum { | |
| 269 is_definitely_current_thread = true | |
| 270 }; | |
| 271 | |
| 272 // Constructor | |
| 273 Thread(); | |
| 274 virtual ~Thread(); | |
| 275 | |
| 276 // initializtion | |
| 277 void initialize_thread_local_storage(); | |
| 278 | |
| 279 // thread entry point | |
| 280 virtual void run(); | |
| 281 | |
| 282 // Testers | |
| 283 virtual bool is_VM_thread() const { return false; } | |
| 284 virtual bool is_Java_thread() const { return false; } | |
| 285 virtual bool is_Compiler_thread() const { return false; } | |
| 286 virtual bool is_hidden_from_external_view() const { return false; } | |
| 287 virtual bool is_jvmti_agent_thread() const { return false; } | |
| 288 // True iff the thread can perform GC operations at a safepoint. | |
| 289 // Generally will be true only of VM thread and parallel GC WorkGang | |
| 290 // threads. | |
| 291 virtual bool is_GC_task_thread() const { return false; } | |
| 292 virtual bool is_Watcher_thread() const { return false; } | |
| 293 virtual bool is_ConcurrentGC_thread() const { return false; } | |
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294 virtual bool is_Named_thread() const { return false; } |
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295 virtual bool is_Worker_thread() const { return false; } |
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296 |
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297 // Casts |
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298 virtual WorkerThread* as_Worker_thread() const { return NULL; } |
| 0 | 299 |
| 300 virtual char* name() const { return (char*)"Unknown thread"; } | |
| 301 | |
| 302 // Returns the current thread | |
| 303 static inline Thread* current(); | |
| 304 | |
| 305 // Common thread operations | |
| 306 static void set_priority(Thread* thread, ThreadPriority priority); | |
| 307 static ThreadPriority get_priority(const Thread* const thread); | |
| 308 static void start(Thread* thread); | |
| 309 static void interrupt(Thread* thr); | |
| 310 static bool is_interrupted(Thread* thr, bool clear_interrupted); | |
| 311 | |
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312 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; } |
| 0 | 313 Monitor* SR_lock() const { return _SR_lock; } |
| 314 | |
| 315 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } | |
| 316 | |
| 317 void set_suspend_flag(SuspendFlags f) { | |
| 318 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); | |
| 319 uint32_t flags; | |
| 320 do { | |
| 321 flags = _suspend_flags; | |
| 322 } | |
| 323 while (Atomic::cmpxchg((jint)(flags | f), | |
| 324 (volatile jint*)&_suspend_flags, | |
| 325 (jint)flags) != (jint)flags); | |
| 326 } | |
| 327 void clear_suspend_flag(SuspendFlags f) { | |
| 328 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); | |
| 329 uint32_t flags; | |
| 330 do { | |
| 331 flags = _suspend_flags; | |
| 332 } | |
| 333 while (Atomic::cmpxchg((jint)(flags & ~f), | |
| 334 (volatile jint*)&_suspend_flags, | |
| 335 (jint)flags) != (jint)flags); | |
| 336 } | |
| 337 | |
| 338 void set_has_async_exception() { | |
| 339 set_suspend_flag(_has_async_exception); | |
| 340 } | |
| 341 void clear_has_async_exception() { | |
| 342 clear_suspend_flag(_has_async_exception); | |
| 343 } | |
| 344 | |
| 345 // Support for Unhandled Oop detection | |
| 346 #ifdef CHECK_UNHANDLED_OOPS | |
| 347 private: | |
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348 UnhandledOops* _unhandled_oops; |
| 0 | 349 public: |
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350 UnhandledOops* unhandled_oops() { return _unhandled_oops; } |
| 0 | 351 // Mark oop safe for gc. It may be stack allocated but won't move. |
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352 void allow_unhandled_oop(oop *op) { |
| 0 | 353 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); |
| 354 } | |
| 355 // Clear oops at safepoint so crashes point to unhandled oop violator | |
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356 void clear_unhandled_oops() { |
| 0 | 357 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); |
| 358 } | |
| 359 bool is_gc_locked_out() { return _gc_locked_out_count > 0; } | |
| 360 #endif // CHECK_UNHANDLED_OOPS | |
| 361 | |
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362 #ifndef PRODUCT |
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363 bool skip_gcalot() { return _skip_gcalot; } |
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364 void set_skip_gcalot(bool v) { _skip_gcalot = v; } |
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365 #endif |
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366 |
| 0 | 367 public: |
| 368 // Installs a pending exception to be inserted later | |
| 369 static void send_async_exception(oop thread_oop, oop java_throwable); | |
| 370 | |
| 371 // Resource area | |
| 372 ResourceArea* resource_area() const { return _resource_area; } | |
| 373 void set_resource_area(ResourceArea* area) { _resource_area = area; } | |
| 374 | |
| 375 OSThread* osthread() const { return _osthread; } | |
| 376 void set_osthread(OSThread* thread) { _osthread = thread; } | |
| 377 | |
| 378 // JNI handle support | |
| 379 JNIHandleBlock* active_handles() const { return _active_handles; } | |
| 380 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } | |
| 381 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } | |
| 382 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } | |
| 383 | |
| 384 // Internal handle support | |
| 385 HandleArea* handle_area() const { return _handle_area; } | |
| 386 void set_handle_area(HandleArea* area) { _handle_area = area; } | |
| 387 | |
| 388 // Thread-Local Allocation Buffer (TLAB) support | |
| 389 ThreadLocalAllocBuffer& tlab() { return _tlab; } | |
| 390 void initialize_tlab() { | |
| 391 if (UseTLAB) { | |
| 392 tlab().initialize(); | |
| 393 } | |
| 394 } | |
| 395 | |
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396 jlong allocated_bytes() { return _allocated_bytes; } |
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397 void set_allocated_bytes(jlong value) { _allocated_bytes = value; } |
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398 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; } |
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399 jlong cooked_allocated_bytes() { |
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400 jlong allocated_bytes = OrderAccess::load_acquire(&_allocated_bytes); |
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401 if (UseTLAB) { |
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402 size_t used_bytes = tlab().used_bytes(); |
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403 if ((ssize_t)used_bytes > 0) { |
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404 // More-or-less valid tlab. The load_acquire above should ensure |
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405 // that the result of the add is <= the instantaneous value |
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406 return allocated_bytes + used_bytes; |
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407 } |
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408 } |
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409 return allocated_bytes; |
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410 } |
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411 |
| 0 | 412 // VM operation support |
| 413 int vm_operation_ticket() { return ++_vm_operation_started_count; } | |
| 414 int vm_operation_completed_count() { return _vm_operation_completed_count; } | |
| 415 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } | |
| 416 | |
| 417 // For tracking the heavyweight monitor the thread is pending on. | |
| 418 ObjectMonitor* current_pending_monitor() { | |
| 419 return _current_pending_monitor; | |
| 420 } | |
| 421 void set_current_pending_monitor(ObjectMonitor* monitor) { | |
| 422 _current_pending_monitor = monitor; | |
| 423 } | |
| 424 void set_current_pending_monitor_is_from_java(bool from_java) { | |
| 425 _current_pending_monitor_is_from_java = from_java; | |
| 426 } | |
| 427 bool current_pending_monitor_is_from_java() { | |
| 428 return _current_pending_monitor_is_from_java; | |
| 429 } | |
| 430 | |
| 431 // For tracking the ObjectMonitor on which this thread called Object.wait() | |
| 432 ObjectMonitor* current_waiting_monitor() { | |
| 433 return _current_waiting_monitor; | |
| 434 } | |
| 435 void set_current_waiting_monitor(ObjectMonitor* monitor) { | |
| 436 _current_waiting_monitor = monitor; | |
| 437 } | |
| 438 | |
| 439 // GC support | |
| 440 // Apply "f->do_oop" to all root oops in "this". | |
|
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441 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames |
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442 virtual void oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 443 |
| 444 // Handles the parallel case for the method below. | |
| 445 private: | |
| 446 bool claim_oops_do_par_case(int collection_parity); | |
| 447 public: | |
| 448 // Requires that "collection_parity" is that of the current strong roots | |
| 449 // iteration. If "is_par" is false, sets the parity of "this" to | |
| 450 // "collection_parity", and returns "true". If "is_par" is true, | |
| 451 // uses an atomic instruction to set the current threads parity to | |
| 452 // "collection_parity", if it is not already. Returns "true" iff the | |
| 453 // calling thread does the update, this indicates that the calling thread | |
| 454 // has claimed the thread's stack as a root groop in the current | |
| 455 // collection. | |
| 456 bool claim_oops_do(bool is_par, int collection_parity) { | |
| 457 if (!is_par) { | |
| 458 _oops_do_parity = collection_parity; | |
| 459 return true; | |
| 460 } else { | |
| 461 return claim_oops_do_par_case(collection_parity); | |
| 462 } | |
| 463 } | |
| 464 | |
| 465 // Sweeper support | |
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466 void nmethods_do(CodeBlobClosure* cf); |
| 0 | 467 |
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468 // Used by fast lock support |
| 0 | 469 virtual bool is_lock_owned(address adr) const; |
| 470 | |
| 471 // Check if address is in the stack of the thread (not just for locks). | |
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472 // Warning: the method can only be used on the running thread |
| 0 | 473 bool is_in_stack(address adr) const; |
| 474 | |
| 475 // Sets this thread as starting thread. Returns failure if thread | |
| 476 // creation fails due to lack of memory, too many threads etc. | |
| 477 bool set_as_starting_thread(); | |
| 478 | |
| 479 protected: | |
| 480 // OS data associated with the thread | |
| 481 OSThread* _osthread; // Platform-specific thread information | |
| 482 | |
| 483 // Thread local resource area for temporary allocation within the VM | |
| 484 ResourceArea* _resource_area; | |
| 485 | |
| 486 // Thread local handle area for allocation of handles within the VM | |
| 487 HandleArea* _handle_area; | |
| 488 | |
| 489 // Support for stack overflow handling, get_thread, etc. | |
| 490 address _stack_base; | |
| 491 size_t _stack_size; | |
| 492 uintptr_t _self_raw_id; // used by get_thread (mutable) | |
| 493 int _lgrp_id; | |
| 494 | |
| 495 public: | |
| 496 // Stack overflow support | |
| 497 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } | |
| 498 | |
| 499 void set_stack_base(address base) { _stack_base = base; } | |
| 500 size_t stack_size() const { return _stack_size; } | |
| 501 void set_stack_size(size_t size) { _stack_size = size; } | |
| 502 void record_stack_base_and_size(); | |
| 503 | |
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504 bool on_local_stack(address adr) const { |
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505 /* QQQ this has knowledge of direction, ought to be a stack method */ |
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506 return (_stack_base >= adr && adr >= (_stack_base - _stack_size)); |
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507 } |
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508 |
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509 uintptr_t self_raw_id() { return _self_raw_id; } |
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510 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; } |
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511 |
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512 int lgrp_id() const { return _lgrp_id; } |
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513 void set_lgrp_id(int value) { _lgrp_id = value; } |
| 0 | 514 |
| 515 // Printing | |
| 516 void print_on(outputStream* st) const; | |
| 517 void print() const { print_on(tty); } | |
| 518 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; | |
| 519 | |
| 520 // Debug-only code | |
| 521 | |
| 522 #ifdef ASSERT | |
| 523 private: | |
| 524 // Deadlock detection support for Mutex locks. List of locks own by thread. | |
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525 Monitor* _owned_locks; |
| 0 | 526 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, |
| 527 // thus the friendship | |
| 528 friend class Mutex; | |
| 529 friend class Monitor; | |
| 530 | |
| 531 public: | |
| 532 void print_owned_locks_on(outputStream* st) const; | |
| 533 void print_owned_locks() const { print_owned_locks_on(tty); } | |
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534 Monitor* owned_locks() const { return _owned_locks; } |
| 0 | 535 bool owns_locks() const { return owned_locks() != NULL; } |
| 536 bool owns_locks_but_compiled_lock() const; | |
| 537 | |
| 538 // Deadlock detection | |
| 539 bool allow_allocation() { return _allow_allocation_count == 0; } | |
| 540 #endif | |
| 541 | |
| 542 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; | |
| 543 | |
| 544 private: | |
| 545 volatile int _jvmti_env_iteration_count; | |
| 546 | |
| 547 public: | |
| 548 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } | |
| 549 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } | |
| 550 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } | |
| 551 | |
| 552 // Code generation | |
| 553 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); } | |
| 554 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); } | |
| 555 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); } | |
| 556 | |
| 557 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); } | |
| 558 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); } | |
| 559 | |
| 560 #define TLAB_FIELD_OFFSET(name) \ | |
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561 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } |
| 0 | 562 |
| 563 TLAB_FIELD_OFFSET(start) | |
| 564 TLAB_FIELD_OFFSET(end) | |
| 565 TLAB_FIELD_OFFSET(top) | |
| 566 TLAB_FIELD_OFFSET(pf_top) | |
| 567 TLAB_FIELD_OFFSET(size) // desired_size | |
| 568 TLAB_FIELD_OFFSET(refill_waste_limit) | |
| 569 TLAB_FIELD_OFFSET(number_of_refills) | |
| 570 TLAB_FIELD_OFFSET(fast_refill_waste) | |
| 571 TLAB_FIELD_OFFSET(slow_allocations) | |
| 572 | |
| 573 #undef TLAB_FIELD_OFFSET | |
| 574 | |
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575 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); } |
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576 |
| 0 | 577 public: |
| 578 volatile intptr_t _Stalled ; | |
| 579 volatile int _TypeTag ; | |
| 580 ParkEvent * _ParkEvent ; // for synchronized() | |
| 581 ParkEvent * _SleepEvent ; // for Thread.sleep | |
| 582 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor | |
| 583 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease | |
| 584 int NativeSyncRecursion ; // diagnostic | |
| 585 | |
| 586 volatile int _OnTrap ; // Resume-at IP delta | |
| 587 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG | |
| 588 jint _hashStateX ; // thread-specific hashCode generator state | |
| 589 jint _hashStateY ; | |
| 590 jint _hashStateZ ; | |
| 591 void * _schedctl ; | |
| 592 | |
| 593 intptr_t _ScratchA, _ScratchB ; // Scratch locations for fast-path sync code | |
| 594 static ByteSize ScratchA_offset() { return byte_offset_of(Thread, _ScratchA ); } | |
| 595 static ByteSize ScratchB_offset() { return byte_offset_of(Thread, _ScratchB ); } | |
| 596 | |
| 597 volatile jint rng [4] ; // RNG for spin loop | |
| 598 | |
| 599 // Low-level leaf-lock primitives used to implement synchronization | |
| 600 // and native monitor-mutex infrastructure. | |
| 601 // Not for general synchronization use. | |
| 602 static void SpinAcquire (volatile int * Lock, const char * Name) ; | |
| 603 static void SpinRelease (volatile int * Lock) ; | |
| 604 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ; | |
| 605 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ; | |
| 606 static void muxRelease (volatile intptr_t * Lock) ; | |
| 607 }; | |
| 608 | |
| 609 // Inline implementation of Thread::current() | |
| 610 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of | |
| 611 // startup. | |
| 612 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same | |
| 613 // period. This is inlined in thread_<os_family>.inline.hpp. | |
| 614 | |
| 615 inline Thread* Thread::current() { | |
| 616 #ifdef ASSERT | |
| 617 // This function is very high traffic. Define PARANOID to enable expensive | |
| 618 // asserts. | |
| 619 #ifdef PARANOID | |
| 620 // Signal handler should call ThreadLocalStorage::get_thread_slow() | |
| 621 Thread* t = ThreadLocalStorage::get_thread_slow(); | |
| 622 assert(t != NULL && !t->is_inside_signal_handler(), | |
| 623 "Don't use Thread::current() inside signal handler"); | |
| 624 #endif | |
| 625 #endif | |
| 626 Thread* thread = ThreadLocalStorage::thread(); | |
| 627 assert(thread != NULL, "just checking"); | |
| 628 return thread; | |
| 629 } | |
| 630 | |
| 631 // Name support for threads. non-JavaThread subclasses with multiple | |
| 632 // uniquely named instances should derive from this. | |
| 633 class NamedThread: public Thread { | |
| 634 friend class VMStructs; | |
| 635 enum { | |
| 636 max_name_len = 64 | |
| 637 }; | |
| 638 private: | |
| 639 char* _name; | |
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640 // log JavaThread being processed by oops_do |
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641 JavaThread* _processed_thread; |
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642 |
| 0 | 643 public: |
| 644 NamedThread(); | |
| 645 ~NamedThread(); | |
| 646 // May only be called once per thread. | |
| 647 void set_name(const char* format, ...); | |
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648 virtual bool is_Named_thread() const { return true; } |
| 0 | 649 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } |
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650 JavaThread *processed_thread() { return _processed_thread; } |
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651 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; } |
| 0 | 652 }; |
| 653 | |
| 654 // Worker threads are named and have an id of an assigned work. | |
| 655 class WorkerThread: public NamedThread { | |
| 656 private: | |
| 657 uint _id; | |
| 658 public: | |
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659 WorkerThread() : _id(0) { } |
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660 virtual bool is_Worker_thread() const { return true; } |
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661 |
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662 virtual WorkerThread* as_Worker_thread() const { |
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663 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?"); |
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664 return (WorkerThread*) this; |
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665 } |
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666 |
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667 void set_id(uint work_id) { _id = work_id; } |
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668 uint id() const { return _id; } |
| 0 | 669 }; |
| 670 | |
| 671 // A single WatcherThread is used for simulating timer interrupts. | |
| 672 class WatcherThread: public Thread { | |
| 673 friend class VMStructs; | |
| 674 public: | |
| 675 virtual void run(); | |
| 676 | |
| 677 private: | |
| 678 static WatcherThread* _watcher_thread; | |
| 679 | |
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680 volatile static bool _should_terminate; // updated without holding lock |
| 0 | 681 public: |
| 682 enum SomeConstants { | |
| 683 delay_interval = 10 // interrupt delay in milliseconds | |
| 684 }; | |
| 685 | |
| 686 // Constructor | |
| 687 WatcherThread(); | |
| 688 | |
| 689 // Tester | |
| 690 bool is_Watcher_thread() const { return true; } | |
| 691 | |
| 692 // Printing | |
| 693 char* name() const { return (char*)"VM Periodic Task Thread"; } | |
| 694 void print_on(outputStream* st) const; | |
| 695 void print() const { print_on(tty); } | |
| 696 | |
| 697 // Returns the single instance of WatcherThread | |
| 698 static WatcherThread* watcher_thread() { return _watcher_thread; } | |
| 699 | |
| 700 // Create and start the single instance of WatcherThread, or stop it on shutdown | |
| 701 static void start(); | |
| 702 static void stop(); | |
| 703 }; | |
| 704 | |
| 705 | |
| 706 class CompilerThread; | |
| 707 | |
| 708 typedef void (*ThreadFunction)(JavaThread*, TRAPS); | |
| 709 | |
| 710 class JavaThread: public Thread { | |
| 711 friend class VMStructs; | |
| 712 private: | |
| 713 JavaThread* _next; // The next thread in the Threads list | |
| 714 oop _threadObj; // The Java level thread object | |
| 715 | |
| 716 #ifdef ASSERT | |
| 717 private: | |
| 718 int _java_call_counter; | |
| 719 | |
| 720 public: | |
| 721 int java_call_counter() { return _java_call_counter; } | |
| 722 void inc_java_call_counter() { _java_call_counter++; } | |
| 723 void dec_java_call_counter() { | |
| 724 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); | |
| 725 _java_call_counter--; | |
| 726 } | |
| 727 private: // restore original namespace restriction | |
| 728 #endif // ifdef ASSERT | |
| 729 | |
| 730 #ifndef PRODUCT | |
| 731 public: | |
| 732 enum { | |
| 733 jump_ring_buffer_size = 16 | |
| 734 }; | |
| 735 private: // restore original namespace restriction | |
| 736 #endif | |
| 737 | |
| 738 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state | |
| 739 | |
| 740 ThreadFunction _entry_point; | |
| 741 | |
| 742 JNIEnv _jni_environment; | |
| 743 | |
| 744 // Deopt support | |
| 745 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization | |
| 746 | |
| 747 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we | |
| 748 // transition out of native | |
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749 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized |
| 0 | 750 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays |
| 751 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped | |
| 752 // Because deoptimization is lazy we must save jvmti requests to set locals | |
| 753 // in compiled frames until we deoptimize and we have an interpreter frame. | |
| 754 // This holds the pointer to array (yeah like there might be more than one) of | |
| 755 // description of compiled vframes that have locals that need to be updated. | |
| 756 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; | |
| 757 | |
| 758 // Handshake value for fixing 6243940. We need a place for the i2c | |
| 759 // adapter to store the callee methodOop. This value is NEVER live | |
| 760 // across a gc point so it does NOT have to be gc'd | |
| 761 // The handshake is open ended since we can't be certain that it will | |
| 762 // be NULLed. This is because we rarely ever see the race and end up | |
| 763 // in handle_wrong_method which is the backend of the handshake. See | |
| 764 // code in i2c adapters and handle_wrong_method. | |
| 765 | |
| 766 methodOop _callee_target; | |
| 767 | |
| 768 // Oop results of VM runtime calls | |
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769 oop _vm_result; // Used to pass back an oop result into Java code, GC-preserved |
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770 oop _vm_result_2; // Used to pass back an oop result into Java code, GC-preserved |
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771 |
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772 // See ReduceInitialCardMarks: this holds the precise space interval of |
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773 // the most recent slow path allocation for which compiled code has |
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774 // elided card-marks for performance along the fast-path. |
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775 MemRegion _deferred_card_mark; |
| 0 | 776 |
| 777 MonitorChunk* _monitor_chunks; // Contains the off stack monitors | |
| 778 // allocated during deoptimization | |
| 779 // and by JNI_MonitorEnter/Exit | |
| 780 | |
| 781 // Async. requests support | |
| 782 enum AsyncRequests { | |
| 783 _no_async_condition = 0, | |
| 784 _async_exception, | |
| 785 _async_unsafe_access_error | |
| 786 }; | |
| 787 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request | |
| 788 oop _pending_async_exception; | |
| 789 | |
| 790 // Safepoint support | |
| 791 public: // Expose _thread_state for SafeFetchInt() | |
| 792 volatile JavaThreadState _thread_state; | |
| 793 private: | |
| 794 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint | |
| 795 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened | |
| 796 | |
| 797 // JavaThread termination support | |
| 798 enum TerminatedTypes { | |
| 799 _not_terminated = 0xDEAD - 2, | |
| 800 _thread_exiting, // JavaThread::exit() has been called for this thread | |
| 801 _thread_terminated, // JavaThread is removed from thread list | |
| 802 _vm_exited // JavaThread is still executing native code, but VM is terminated | |
| 803 // only VM_Exit can set _vm_exited | |
| 804 }; | |
| 805 | |
| 806 // In general a JavaThread's _terminated field transitions as follows: | |
| 807 // | |
| 808 // _not_terminated => _thread_exiting => _thread_terminated | |
| 809 // | |
| 810 // _vm_exited is a special value to cover the case of a JavaThread | |
| 811 // executing native code after the VM itself is terminated. | |
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812 volatile TerminatedTypes _terminated; |
| 0 | 813 // suspend/resume support |
| 814 volatile bool _suspend_equivalent; // Suspend equivalent condition | |
| 815 jint _in_deopt_handler; // count of deoptimization | |
| 816 // handlers thread is in | |
| 817 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access | |
| 818 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was | |
| 819 // never locked) when throwing an exception. Used by interpreter only. | |
| 820 | |
| 821 // Flag to mark a JNI thread in the process of attaching - See CR 6404306 | |
| 822 // This flag is never set true other than at construction, and in that case | |
| 823 // is shortly thereafter set false | |
| 824 volatile bool _is_attaching; | |
| 825 | |
| 826 public: | |
| 827 // State of the stack guard pages for this thread. | |
| 828 enum StackGuardState { | |
| 829 stack_guard_unused, // not needed | |
| 830 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow | |
| 831 stack_guard_enabled // enabled | |
| 832 }; | |
| 833 | |
| 834 private: | |
| 835 | |
| 836 StackGuardState _stack_guard_state; | |
| 837 | |
| 838 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is | |
| 839 // used to temp. parsing values into and out of the runtime system during exception handling for compiled | |
| 840 // code) | |
| 841 volatile oop _exception_oop; // Exception thrown in compiled code | |
| 842 volatile address _exception_pc; // PC where exception happened | |
| 843 volatile address _exception_handler_pc; // PC for handler of exception | |
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844 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. |
| 0 | 845 |
| 846 // support for compilation | |
| 847 bool _is_compiling; // is true if a compilation is active inthis thread (one compilation per thread possible) | |
| 848 | |
| 849 // support for JNI critical regions | |
| 850 jint _jni_active_critical; // count of entries into JNI critical region | |
| 851 | |
| 852 // For deadlock detection. | |
| 853 int _depth_first_number; | |
| 854 | |
| 855 // JVMTI PopFrame support | |
| 856 // This is set to popframe_pending to signal that top Java frame should be popped immediately | |
| 857 int _popframe_condition; | |
| 858 | |
| 859 #ifndef PRODUCT | |
| 860 int _jmp_ring_index; | |
| 861 struct { | |
| 862 // We use intptr_t instead of address so debugger doesn't try and display strings | |
| 863 intptr_t _target; | |
| 864 intptr_t _instruction; | |
| 865 const char* _file; | |
| 866 int _line; | |
| 867 } _jmp_ring[ jump_ring_buffer_size ]; | |
| 868 #endif /* PRODUCT */ | |
| 869 | |
| 342 | 870 #ifndef SERIALGC |
| 871 // Support for G1 barriers | |
| 872 | |
| 873 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier. | |
| 874 // Set of all such queues. | |
| 875 static SATBMarkQueueSet _satb_mark_queue_set; | |
| 876 | |
| 877 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. | |
| 878 // Set of all such queues. | |
| 879 static DirtyCardQueueSet _dirty_card_queue_set; | |
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880 |
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881 void flush_barrier_queues(); |
| 342 | 882 #endif // !SERIALGC |
| 883 | |
| 0 | 884 friend class VMThread; |
| 885 friend class ThreadWaitTransition; | |
| 886 friend class VM_Exit; | |
| 887 | |
| 888 void initialize(); // Initialized the instance variables | |
| 889 | |
| 890 public: | |
| 891 // Constructor | |
| 892 JavaThread(bool is_attaching = false); // for main thread and JNI attached threads | |
| 893 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); | |
| 894 ~JavaThread(); | |
| 895 | |
| 896 #ifdef ASSERT | |
| 897 // verify this JavaThread hasn't be published in the Threads::list yet | |
| 898 void verify_not_published(); | |
| 899 #endif | |
| 900 | |
| 901 //JNI functiontable getter/setter for JVMTI jni function table interception API. | |
| 902 void set_jni_functions(struct JNINativeInterface_* functionTable) { | |
| 903 _jni_environment.functions = functionTable; | |
| 904 } | |
| 905 struct JNINativeInterface_* get_jni_functions() { | |
| 906 return (struct JNINativeInterface_ *)_jni_environment.functions; | |
| 907 } | |
| 908 | |
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909 // This function is called at thread creation to allow |
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910 // platform specific thread variables to be initialized. |
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911 void cache_global_variables(); |
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912 |
| 0 | 913 // Executes Shutdown.shutdown() |
| 914 void invoke_shutdown_hooks(); | |
| 915 | |
| 916 // Cleanup on thread exit | |
| 917 enum ExitType { | |
| 918 normal_exit, | |
| 919 jni_detach | |
| 920 }; | |
| 921 void exit(bool destroy_vm, ExitType exit_type = normal_exit); | |
| 922 | |
| 923 void cleanup_failed_attach_current_thread(); | |
| 924 | |
| 925 // Testers | |
| 926 virtual bool is_Java_thread() const { return true; } | |
| 927 | |
| 928 // compilation | |
| 929 void set_is_compiling(bool f) { _is_compiling = f; } | |
| 930 bool is_compiling() const { return _is_compiling; } | |
| 931 | |
| 932 // Thread chain operations | |
| 933 JavaThread* next() const { return _next; } | |
| 934 void set_next(JavaThread* p) { _next = p; } | |
| 935 | |
| 936 // Thread oop. threadObj() can be NULL for initial JavaThread | |
| 937 // (or for threads attached via JNI) | |
| 938 oop threadObj() const { return _threadObj; } | |
| 939 void set_threadObj(oop p) { _threadObj = p; } | |
| 940 | |
| 941 ThreadPriority java_priority() const; // Read from threadObj() | |
| 942 | |
| 943 // Prepare thread and add to priority queue. If a priority is | |
| 944 // not specified, use the priority of the thread object. Threads_lock | |
| 945 // must be held while this function is called. | |
| 946 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); | |
| 947 | |
| 948 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } | |
| 949 address saved_exception_pc() { return _saved_exception_pc; } | |
| 950 | |
| 951 | |
| 952 ThreadFunction entry_point() const { return _entry_point; } | |
| 953 | |
| 954 // Allocates a new Java level thread object for this thread. thread_name may be NULL. | |
| 955 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS); | |
| 956 | |
| 957 // Last frame anchor routines | |
| 958 | |
| 959 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } | |
| 960 | |
| 961 // last_Java_sp | |
| 962 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } | |
| 963 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } | |
| 964 | |
| 965 // last_Java_pc | |
| 966 | |
| 967 address last_Java_pc(void) { return _anchor.last_Java_pc(); } | |
| 968 | |
| 969 // Safepoint support | |
| 970 JavaThreadState thread_state() const { return _thread_state; } | |
| 971 void set_thread_state(JavaThreadState s) { _thread_state=s; } | |
| 972 ThreadSafepointState *safepoint_state() const { return _safepoint_state; } | |
| 973 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } | |
| 974 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } | |
| 975 | |
| 976 // thread has called JavaThread::exit() or is terminated | |
| 977 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); } | |
| 978 // thread is terminated (no longer on the threads list); we compare | |
| 979 // against the two non-terminated values so that a freed JavaThread | |
| 980 // will also be considered terminated. | |
| 981 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; } | |
| 982 void set_terminated(TerminatedTypes t) { _terminated = t; } | |
| 983 // special for Threads::remove() which is static: | |
| 984 void set_terminated_value() { _terminated = _thread_terminated; } | |
| 985 void block_if_vm_exited(); | |
| 986 | |
| 987 bool doing_unsafe_access() { return _doing_unsafe_access; } | |
| 988 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } | |
| 989 | |
| 990 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } | |
| 991 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } | |
| 992 | |
| 993 | |
| 994 // Suspend/resume support for JavaThread | |
| 995 | |
| 996 private: | |
| 997 void set_ext_suspended() { set_suspend_flag (_ext_suspended); } | |
| 998 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); } | |
| 999 | |
| 1000 public: | |
| 1001 void java_suspend(); | |
| 1002 void java_resume(); | |
| 1003 int java_suspend_self(); | |
| 1004 | |
| 1005 void check_and_wait_while_suspended() { | |
| 1006 assert(JavaThread::current() == this, "sanity check"); | |
| 1007 | |
| 1008 bool do_self_suspend; | |
| 1009 do { | |
| 1010 // were we externally suspended while we were waiting? | |
| 1011 do_self_suspend = handle_special_suspend_equivalent_condition(); | |
| 1012 if (do_self_suspend) { | |
| 1013 // don't surprise the thread that suspended us by returning | |
| 1014 java_suspend_self(); | |
| 1015 set_suspend_equivalent(); | |
| 1016 } | |
| 1017 } while (do_self_suspend); | |
| 1018 } | |
| 1019 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); | |
| 1020 // Check for async exception in addition to safepoint and suspend request. | |
| 1021 static void check_special_condition_for_native_trans(JavaThread *thread); | |
| 1022 | |
| 1023 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); | |
| 1024 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { | |
| 1025 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1026 // Warning: is_ext_suspend_completed() may temporarily drop the | |
| 1027 // SR_lock to allow the thread to reach a stable thread state if | |
| 1028 // it is currently in a transient thread state. | |
| 1029 return is_ext_suspend_completed(false /*!called_by_wait */, | |
| 1030 SuspendRetryDelay, bits); | |
| 1031 } | |
| 1032 | |
| 1033 // We cannot allow wait_for_ext_suspend_completion() to run forever or | |
| 1034 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally | |
| 1035 // passed as the count and delay parameters. Experiments with specific | |
| 1036 // calls to wait_for_ext_suspend_completion() can be done by passing | |
| 1037 // other values in the code. Experiments with all calls can be done | |
| 1038 // via the appropriate -XX options. | |
| 1039 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); | |
| 1040 | |
| 1041 void set_external_suspend() { set_suspend_flag (_external_suspend); } | |
| 1042 void clear_external_suspend() { clear_suspend_flag(_external_suspend); } | |
| 1043 | |
| 1044 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); } | |
| 1045 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); } | |
| 1046 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } | |
| 1047 | |
| 1048 bool is_external_suspend() const { | |
| 1049 return (_suspend_flags & _external_suspend) != 0; | |
| 1050 } | |
| 1051 // Whenever a thread transitions from native to vm/java it must suspend | |
| 1052 // if external|deopt suspend is present. | |
| 1053 bool is_suspend_after_native() const { | |
| 1054 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0; | |
| 1055 } | |
| 1056 | |
| 1057 // external suspend request is completed | |
| 1058 bool is_ext_suspended() const { | |
| 1059 return (_suspend_flags & _ext_suspended) != 0; | |
| 1060 } | |
| 1061 | |
| 1062 bool is_external_suspend_with_lock() const { | |
| 1063 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1064 return is_external_suspend(); | |
| 1065 } | |
| 1066 | |
| 1067 // Special method to handle a pending external suspend request | |
| 1068 // when a suspend equivalent condition lifts. | |
| 1069 bool handle_special_suspend_equivalent_condition() { | |
| 1070 assert(is_suspend_equivalent(), | |
| 1071 "should only be called in a suspend equivalence condition"); | |
| 1072 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1073 bool ret = is_external_suspend(); | |
| 1074 if (!ret) { | |
| 1075 // not about to self-suspend so clear suspend equivalence | |
| 1076 clear_suspend_equivalent(); | |
| 1077 } | |
| 1078 // implied else: | |
| 1079 // We have a pending external suspend request so we leave the | |
| 1080 // suspend_equivalent flag set until java_suspend_self() sets | |
| 1081 // the ext_suspended flag and clears the suspend_equivalent | |
| 1082 // flag. This insures that wait_for_ext_suspend_completion() | |
| 1083 // will return consistent values. | |
| 1084 return ret; | |
| 1085 } | |
| 1086 | |
| 1087 // utility methods to see if we are doing some kind of suspension | |
| 1088 bool is_being_ext_suspended() const { | |
| 1089 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1090 return is_ext_suspended() || is_external_suspend(); | |
| 1091 } | |
| 1092 | |
| 1093 bool is_suspend_equivalent() const { return _suspend_equivalent; } | |
| 1094 | |
| 1095 void set_suspend_equivalent() { _suspend_equivalent = true; }; | |
| 1096 void clear_suspend_equivalent() { _suspend_equivalent = false; }; | |
| 1097 | |
| 1098 // Thread.stop support | |
| 1099 void send_thread_stop(oop throwable); | |
| 1100 AsyncRequests clear_special_runtime_exit_condition() { | |
| 1101 AsyncRequests x = _special_runtime_exit_condition; | |
| 1102 _special_runtime_exit_condition = _no_async_condition; | |
| 1103 return x; | |
| 1104 } | |
| 1105 | |
| 1106 // Are any async conditions present? | |
| 1107 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } | |
| 1108 | |
| 1109 void check_and_handle_async_exceptions(bool check_unsafe_error = true); | |
| 1110 | |
| 1111 // these next two are also used for self-suspension and async exception support | |
| 1112 void handle_special_runtime_exit_condition(bool check_asyncs = true); | |
| 1113 | |
| 1114 // Return true if JavaThread has an asynchronous condition or | |
| 1115 // if external suspension is requested. | |
| 1116 bool has_special_runtime_exit_condition() { | |
| 1117 // We call is_external_suspend() last since external suspend should | |
| 1118 // be less common. Because we don't use is_external_suspend_with_lock | |
| 1119 // it is possible that we won't see an asynchronous external suspend | |
| 1120 // request that has just gotten started, i.e., SR_lock grabbed but | |
| 1121 // _external_suspend field change either not made yet or not visible | |
| 1122 // yet. However, this is okay because the request is asynchronous and | |
| 1123 // we will see the new flag value the next time through. It's also | |
| 1124 // possible that the external suspend request is dropped after | |
| 1125 // we have checked is_external_suspend(), we will recheck its value | |
| 1126 // under SR_lock in java_suspend_self(). | |
| 1127 return (_special_runtime_exit_condition != _no_async_condition) || | |
| 1128 is_external_suspend() || is_deopt_suspend(); | |
| 1129 } | |
| 1130 | |
| 1131 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } | |
| 1132 | |
| 1133 void set_pending_async_exception(oop e) { | |
| 1134 _pending_async_exception = e; | |
| 1135 _special_runtime_exit_condition = _async_exception; | |
| 1136 set_has_async_exception(); | |
| 1137 } | |
| 1138 | |
| 1139 // Fast-locking support | |
| 1140 bool is_lock_owned(address adr) const; | |
| 1141 | |
| 1142 // Accessors for vframe array top | |
| 1143 // The linked list of vframe arrays are sorted on sp. This means when we | |
| 1144 // unpack the head must contain the vframe array to unpack. | |
| 1145 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } | |
| 1146 vframeArray* vframe_array_head() const { return _vframe_array_head; } | |
| 1147 | |
| 1148 // Side structure for defering update of java frame locals until deopt occurs | |
| 1149 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } | |
| 1150 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } | |
| 1151 | |
| 1152 // These only really exist to make debugging deopt problems simpler | |
| 1153 | |
| 1154 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } | |
| 1155 vframeArray* vframe_array_last() const { return _vframe_array_last; } | |
| 1156 | |
| 1157 // The special resourceMark used during deoptimization | |
| 1158 | |
| 1159 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } | |
| 1160 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } | |
| 1161 | |
| 1162 intptr_t* must_deopt_id() { return _must_deopt_id; } | |
| 1163 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } | |
| 1164 void clear_must_deopt_id() { _must_deopt_id = NULL; } | |
| 1165 | |
|
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1166 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; } |
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1167 nmethod* deopt_nmethod() { return _deopt_nmethod; } |
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1168 |
| 0 | 1169 methodOop callee_target() const { return _callee_target; } |
| 1170 void set_callee_target (methodOop x) { _callee_target = x; } | |
| 1171 | |
| 1172 // Oop results of vm runtime calls | |
| 1173 oop vm_result() const { return _vm_result; } | |
| 1174 void set_vm_result (oop x) { _vm_result = x; } | |
| 1175 | |
| 1176 oop vm_result_2() const { return _vm_result_2; } | |
| 1177 void set_vm_result_2 (oop x) { _vm_result_2 = x; } | |
| 1178 | |
|
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1179 MemRegion deferred_card_mark() const { return _deferred_card_mark; } |
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1180 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } |
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1181 |
| 0 | 1182 // Exception handling for compiled methods |
| 1183 oop exception_oop() const { return _exception_oop; } | |
| 1184 address exception_pc() const { return _exception_pc; } | |
| 1185 address exception_handler_pc() const { return _exception_handler_pc; } | |
|
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1186 bool is_method_handle_return() const { return _is_method_handle_return == 1; } |
| 0 | 1187 |
| 1188 void set_exception_oop(oop o) { _exception_oop = o; } | |
| 1189 void set_exception_pc(address a) { _exception_pc = a; } | |
| 1190 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } | |
|
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1191 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } |
| 0 | 1192 |
| 1193 // Stack overflow support | |
| 1194 inline size_t stack_available(address cur_sp); | |
| 1195 address stack_yellow_zone_base() | |
| 1196 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); } | |
| 1197 size_t stack_yellow_zone_size() | |
| 1198 { return StackYellowPages * os::vm_page_size(); } | |
| 1199 address stack_red_zone_base() | |
| 1200 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); } | |
| 1201 size_t stack_red_zone_size() | |
| 1202 { return StackRedPages * os::vm_page_size(); } | |
| 1203 bool in_stack_yellow_zone(address a) | |
| 1204 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); } | |
| 1205 bool in_stack_red_zone(address a) | |
| 1206 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); } | |
| 1207 | |
| 1208 void create_stack_guard_pages(); | |
| 1209 void remove_stack_guard_pages(); | |
| 1210 | |
| 1211 void enable_stack_yellow_zone(); | |
| 1212 void disable_stack_yellow_zone(); | |
| 1213 void enable_stack_red_zone(); | |
| 1214 void disable_stack_red_zone(); | |
| 1215 | |
| 1216 inline bool stack_yellow_zone_disabled(); | |
| 1217 inline bool stack_yellow_zone_enabled(); | |
| 1218 | |
| 1219 // Attempt to reguard the stack after a stack overflow may have occurred. | |
| 1220 // Returns true if (a) guard pages are not needed on this thread, (b) the | |
| 1221 // pages are already guarded, or (c) the pages were successfully reguarded. | |
| 1222 // Returns false if there is not enough stack space to reguard the pages, in | |
| 1223 // which case the caller should unwind a frame and try again. The argument | |
| 1224 // should be the caller's (approximate) sp. | |
| 1225 bool reguard_stack(address cur_sp); | |
| 1226 // Similar to above but see if current stackpoint is out of the guard area | |
| 1227 // and reguard if possible. | |
| 1228 bool reguard_stack(void); | |
| 1229 | |
| 1230 // Misc. accessors/mutators | |
| 1231 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } | |
| 1232 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } | |
| 1233 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } | |
| 1234 | |
| 1235 #ifndef PRODUCT | |
| 1236 void record_jump(address target, address instr, const char* file, int line); | |
| 1237 #endif /* PRODUCT */ | |
| 1238 | |
| 1239 // For assembly stub generation | |
| 1240 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); } | |
| 1241 #ifndef PRODUCT | |
| 1242 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); } | |
| 1243 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); } | |
| 1244 #endif /* PRODUCT */ | |
| 1245 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); } | |
| 1246 static ByteSize last_Java_sp_offset() { | |
| 1247 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); | |
| 1248 } | |
| 1249 static ByteSize last_Java_pc_offset() { | |
| 1250 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); | |
| 1251 } | |
| 1252 static ByteSize frame_anchor_offset() { | |
| 1253 return byte_offset_of(JavaThread, _anchor); | |
| 1254 } | |
| 1255 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); } | |
| 1256 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); } | |
| 1257 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); } | |
| 1258 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); } | |
| 1259 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); } | |
| 1260 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); } | |
| 1261 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); } | |
| 1262 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); } | |
| 1263 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } | |
|
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1264 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } |
| 0 | 1265 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); } |
| 1266 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); } | |
| 1267 | |
| 1268 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } | |
|
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1269 static ByteSize should_post_on_exceptions_flag_offset() { |
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1270 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); |
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1271 } |
| 0 | 1272 |
| 342 | 1273 #ifndef SERIALGC |
| 1274 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } | |
| 1275 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } | |
| 1276 #endif // !SERIALGC | |
| 1277 | |
| 0 | 1278 // Returns the jni environment for this thread |
| 1279 JNIEnv* jni_environment() { return &_jni_environment; } | |
| 1280 | |
| 1281 static JavaThread* thread_from_jni_environment(JNIEnv* env) { | |
| 1282 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); | |
| 1283 // Only return NULL if thread is off the thread list; starting to | |
| 1284 // exit should not return NULL. | |
| 1285 if (thread_from_jni_env->is_terminated()) { | |
| 1286 thread_from_jni_env->block_if_vm_exited(); | |
| 1287 return NULL; | |
| 1288 } else { | |
| 1289 return thread_from_jni_env; | |
| 1290 } | |
| 1291 } | |
| 1292 | |
| 1293 // JNI critical regions. These can nest. | |
| 1294 bool in_critical() { return _jni_active_critical > 0; } | |
| 1295 void enter_critical() { assert(Thread::current() == this, | |
| 1296 "this must be current thread"); | |
| 1297 _jni_active_critical++; } | |
| 1298 void exit_critical() { assert(Thread::current() == this, | |
| 1299 "this must be current thread"); | |
| 1300 _jni_active_critical--; | |
| 1301 assert(_jni_active_critical >= 0, | |
| 1302 "JNI critical nesting problem?"); } | |
| 1303 | |
| 1304 // For deadlock detection | |
| 1305 int depth_first_number() { return _depth_first_number; } | |
| 1306 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } | |
| 1307 | |
| 1308 private: | |
| 1309 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } | |
| 1310 | |
| 1311 public: | |
| 1312 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } | |
| 1313 void add_monitor_chunk(MonitorChunk* chunk); | |
| 1314 void remove_monitor_chunk(MonitorChunk* chunk); | |
| 1315 bool in_deopt_handler() const { return _in_deopt_handler > 0; } | |
| 1316 void inc_in_deopt_handler() { _in_deopt_handler++; } | |
| 1317 void dec_in_deopt_handler() { | |
| 1318 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); | |
| 1319 if (_in_deopt_handler > 0) { // robustness | |
| 1320 _in_deopt_handler--; | |
| 1321 } | |
| 1322 } | |
| 1323 | |
| 1324 private: | |
| 1325 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } | |
| 1326 | |
| 1327 public: | |
| 1328 | |
| 1329 // Frame iteration; calls the function f for all frames on the stack | |
| 1330 void frames_do(void f(frame*, const RegisterMap*)); | |
| 1331 | |
| 1332 // Memory operations | |
|
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1333 void oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1334 |
| 1335 // Sweeper operations | |
|
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1336 void nmethods_do(CodeBlobClosure* cf); |
| 0 | 1337 |
| 1338 // Memory management operations | |
| 1339 void gc_epilogue(); | |
| 1340 void gc_prologue(); | |
| 1341 | |
| 1342 // Misc. operations | |
| 1343 char* name() const { return (char*)get_thread_name(); } | |
| 1344 void print_on(outputStream* st) const; | |
| 1345 void print() const { print_on(tty); } | |
| 1346 void print_value(); | |
| 1347 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN; | |
| 1348 void print_thread_state() const PRODUCT_RETURN; | |
| 1349 void print_on_error(outputStream* st, char* buf, int buflen) const; | |
| 1350 void verify(); | |
| 1351 const char* get_thread_name() const; | |
| 1352 private: | |
| 1353 // factor out low-level mechanics for use in both normal and error cases | |
| 1354 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; | |
| 1355 public: | |
| 1356 const char* get_threadgroup_name() const; | |
| 1357 const char* get_parent_name() const; | |
| 1358 | |
| 1359 // Accessing frames | |
| 1360 frame last_frame() { | |
| 1361 _anchor.make_walkable(this); | |
| 1362 return pd_last_frame(); | |
| 1363 } | |
| 1364 javaVFrame* last_java_vframe(RegisterMap* reg_map); | |
| 1365 | |
| 1366 // Returns method at 'depth' java or native frames down the stack | |
| 1367 // Used for security checks | |
| 1368 klassOop security_get_caller_class(int depth); | |
| 1369 | |
| 1370 // Print stack trace in external format | |
| 1371 void print_stack_on(outputStream* st); | |
| 1372 void print_stack() { print_stack_on(tty); } | |
| 1373 | |
| 1374 // Print stack traces in various internal formats | |
| 1375 void trace_stack() PRODUCT_RETURN; | |
| 1376 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; | |
| 1377 void trace_frames() PRODUCT_RETURN; | |
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1378 void trace_oops() PRODUCT_RETURN; |
| 0 | 1379 |
|
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1380 // Print an annotated view of the stack frames |
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1381 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN; |
|
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1382 void validate_frame_layout() { |
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1383 print_frame_layout(0, true); |
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1384 } |
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1385 |
| 0 | 1386 // Returns the number of stack frames on the stack |
| 1387 int depth() const; | |
| 1388 | |
| 1389 // Function for testing deoptimization | |
| 1390 void deoptimize(); | |
| 1391 void make_zombies(); | |
| 1392 | |
| 1393 void deoptimized_wrt_marked_nmethods(); | |
| 1394 | |
| 1395 // Profiling operation (see fprofile.cpp) | |
| 1396 public: | |
| 1397 bool profile_last_Java_frame(frame* fr); | |
| 1398 | |
| 1399 private: | |
| 1400 ThreadProfiler* _thread_profiler; | |
| 1401 private: | |
| 1402 friend class FlatProfiler; // uses both [gs]et_thread_profiler. | |
| 1403 friend class FlatProfilerTask; // uses get_thread_profiler. | |
| 1404 friend class ThreadProfilerMark; // uses get_thread_profiler. | |
| 1405 ThreadProfiler* get_thread_profiler() { return _thread_profiler; } | |
| 1406 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) { | |
| 1407 ThreadProfiler* result = _thread_profiler; | |
| 1408 _thread_profiler = tp; | |
| 1409 return result; | |
| 1410 } | |
| 1411 | |
| 1412 // Static operations | |
| 1413 public: | |
| 1414 // Returns the running thread as a JavaThread | |
| 1415 static inline JavaThread* current(); | |
| 1416 | |
| 1417 // Returns the active Java thread. Do not use this if you know you are calling | |
| 1418 // from a JavaThread, as it's slower than JavaThread::current. If called from | |
| 1419 // the VMThread, it also returns the JavaThread that instigated the VMThread's | |
| 1420 // operation. You may not want that either. | |
| 1421 static JavaThread* active(); | |
| 1422 | |
| 1423 inline CompilerThread* as_CompilerThread(); | |
| 1424 | |
| 1425 public: | |
| 1426 virtual void run(); | |
| 1427 void thread_main_inner(); | |
| 1428 | |
| 1429 private: | |
| 1430 // PRIVILEGED STACK | |
| 1431 PrivilegedElement* _privileged_stack_top; | |
| 1432 GrowableArray<oop>* _array_for_gc; | |
| 1433 public: | |
| 1434 | |
| 1435 // Returns the privileged_stack information. | |
| 1436 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } | |
| 1437 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } | |
| 1438 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } | |
| 1439 | |
| 1440 public: | |
| 1441 // Thread local information maintained by JVMTI. | |
| 1442 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } | |
|
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1443 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() |
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1444 // getter is used to get this JavaThread's JvmtiThreadState if it has |
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1445 // one which means NULL can be returned. JvmtiThreadState::state_for() |
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1446 // is used to get the specified JavaThread's JvmtiThreadState if it has |
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1447 // one or it allocates a new JvmtiThreadState for the JavaThread and |
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1448 // returns it. JvmtiThreadState::state_for() will return NULL only if |
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1449 // the specified JavaThread is exiting. |
| 0 | 1450 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } |
| 1451 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } | |
| 1452 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } | |
| 1453 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } | |
| 1454 | |
| 1455 // JVMTI PopFrame support | |
| 1456 // Setting and clearing popframe_condition | |
| 1457 // All of these enumerated values are bits. popframe_pending | |
| 1458 // indicates that a PopFrame() has been requested and not yet been | |
| 1459 // completed. popframe_processing indicates that that PopFrame() is in | |
| 1460 // the process of being completed. popframe_force_deopt_reexecution_bit | |
| 1461 // indicates that special handling is required when returning to a | |
| 1462 // deoptimized caller. | |
| 1463 enum PopCondition { | |
| 1464 popframe_inactive = 0x00, | |
| 1465 popframe_pending_bit = 0x01, | |
| 1466 popframe_processing_bit = 0x02, | |
| 1467 popframe_force_deopt_reexecution_bit = 0x04 | |
| 1468 }; | |
| 1469 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } | |
| 1470 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } | |
| 1471 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } | |
| 1472 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } | |
| 1473 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } | |
| 1474 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } | |
| 1475 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } | |
| 1476 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } | |
| 1477 #ifdef CC_INTERP | |
| 1478 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } | |
| 1479 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } | |
| 1480 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } | |
| 1481 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } | |
| 1482 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } | |
| 1483 #endif | |
| 1484 | |
| 1485 private: | |
| 1486 // Saved incoming arguments to popped frame. | |
| 1487 // Used only when popped interpreted frame returns to deoptimized frame. | |
| 1488 void* _popframe_preserved_args; | |
| 1489 int _popframe_preserved_args_size; | |
| 1490 | |
| 1491 public: | |
| 1492 void popframe_preserve_args(ByteSize size_in_bytes, void* start); | |
| 1493 void* popframe_preserved_args(); | |
| 1494 ByteSize popframe_preserved_args_size(); | |
| 1495 WordSize popframe_preserved_args_size_in_words(); | |
| 1496 void popframe_free_preserved_args(); | |
| 1497 | |
| 1498 | |
| 1499 private: | |
| 1500 JvmtiThreadState *_jvmti_thread_state; | |
| 1501 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; | |
| 1502 | |
| 1503 // Used by the interpreter in fullspeed mode for frame pop, method | |
| 1504 // entry, method exit and single stepping support. This field is | |
| 1505 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. | |
| 1506 // It can be set to zero asynchronously (i.e., without a VM operation | |
| 1507 // or a lock) so we have to be very careful. | |
| 1508 int _interp_only_mode; | |
| 1509 | |
| 1510 public: | |
| 1511 // used by the interpreter for fullspeed debugging support (see above) | |
| 1512 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } | |
| 1513 bool is_interp_only_mode() { return (_interp_only_mode != 0); } | |
| 1514 int get_interp_only_mode() { return _interp_only_mode; } | |
| 1515 void increment_interp_only_mode() { ++_interp_only_mode; } | |
| 1516 void decrement_interp_only_mode() { --_interp_only_mode; } | |
| 1517 | |
|
1213
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1518 // support for cached flag that indicates whether exceptions need to be posted for this thread |
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1519 // if this is false, we can avoid deoptimizing when events are thrown |
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1520 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything |
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1521 private: |
|
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1522 int _should_post_on_exceptions_flag; |
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1523 |
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1524 public: |
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1525 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } |
|
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1526 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } |
|
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1527 |
| 0 | 1528 private: |
| 1529 ThreadStatistics *_thread_stat; | |
| 1530 | |
| 1531 public: | |
| 1532 ThreadStatistics* get_thread_stat() const { return _thread_stat; } | |
| 1533 | |
| 1534 // Return a blocker object for which this thread is blocked parking. | |
| 1535 oop current_park_blocker(); | |
| 1536 | |
| 1537 private: | |
| 1538 static size_t _stack_size_at_create; | |
| 1539 | |
| 1540 public: | |
| 1541 static inline size_t stack_size_at_create(void) { | |
| 1542 return _stack_size_at_create; | |
| 1543 } | |
| 1544 static inline void set_stack_size_at_create(size_t value) { | |
| 1545 _stack_size_at_create = value; | |
| 1546 } | |
| 1547 | |
| 342 | 1548 #ifndef SERIALGC |
| 1549 // SATB marking queue support | |
| 1550 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; } | |
| 1551 static SATBMarkQueueSet& satb_mark_queue_set() { | |
| 1552 return _satb_mark_queue_set; | |
| 1553 } | |
| 1554 | |
| 1555 // Dirty card queue support | |
| 1556 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } | |
| 1557 static DirtyCardQueueSet& dirty_card_queue_set() { | |
| 1558 return _dirty_card_queue_set; | |
| 1559 } | |
| 1560 #endif // !SERIALGC | |
| 1561 | |
|
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1562 // This method initializes the SATB and dirty card queues before a |
|
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1563 // JavaThread is added to the Java thread list. Right now, we don't |
|
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1564 // have to do anything to the dirty card queue (it should have been |
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1565 // activated when the thread was created), but we have to activate |
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1566 // the SATB queue if the thread is created while a marking cycle is |
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1567 // in progress. The activation / de-activation of the SATB queues at |
|
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1568 // the beginning / end of a marking cycle is done during safepoints |
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1569 // so we have to make sure this method is called outside one to be |
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1570 // able to safely read the active field of the SATB queue set. Right |
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1571 // now, it is called just before the thread is added to the Java |
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1572 // thread list in the Threads::add() method. That method is holding |
|
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1573 // the Threads_lock which ensures we are outside a safepoint. We |
|
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1574 // cannot do the obvious and set the active field of the SATB queue |
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1575 // when the thread is created given that, in some cases, safepoints |
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1576 // might happen between the JavaThread constructor being called and the |
|
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1577 // thread being added to the Java thread list (an example of this is |
|
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1578 // when the structure for the DestroyJavaVM thread is created). |
|
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1579 #ifndef SERIALGC |
|
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1580 void initialize_queues(); |
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1581 #else // !SERIALGC |
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1582 void initialize_queues() { } |
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1583 #endif // !SERIALGC |
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1584 |
| 0 | 1585 // Machine dependent stuff |
| 1972 | 1586 #ifdef TARGET_OS_ARCH_linux_x86 |
| 1587 # include "thread_linux_x86.hpp" | |
| 1588 #endif | |
| 1589 #ifdef TARGET_OS_ARCH_linux_sparc | |
| 1590 # include "thread_linux_sparc.hpp" | |
| 1591 #endif | |
| 1592 #ifdef TARGET_OS_ARCH_linux_zero | |
| 1593 # include "thread_linux_zero.hpp" | |
| 1594 #endif | |
| 1595 #ifdef TARGET_OS_ARCH_solaris_x86 | |
| 1596 # include "thread_solaris_x86.hpp" | |
| 1597 #endif | |
| 1598 #ifdef TARGET_OS_ARCH_solaris_sparc | |
| 1599 # include "thread_solaris_sparc.hpp" | |
| 1600 #endif | |
| 1601 #ifdef TARGET_OS_ARCH_windows_x86 | |
| 1602 # include "thread_windows_x86.hpp" | |
| 1603 #endif | |
|
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1604 #ifdef TARGET_OS_ARCH_linux_arm |
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1605 # include "thread_linux_arm.hpp" |
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1606 #endif |
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1607 #ifdef TARGET_OS_ARCH_linux_ppc |
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1608 # include "thread_linux_ppc.hpp" |
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1609 #endif |
| 1972 | 1610 |
| 0 | 1611 |
| 1612 public: | |
| 1613 void set_blocked_on_compilation(bool value) { | |
| 1614 _blocked_on_compilation = value; | |
| 1615 } | |
| 1616 | |
| 1617 bool blocked_on_compilation() { | |
| 1618 return _blocked_on_compilation; | |
| 1619 } | |
| 1620 protected: | |
| 1621 bool _blocked_on_compilation; | |
| 1622 | |
| 1623 | |
| 1624 // JSR166 per-thread parker | |
| 1625 private: | |
| 1626 Parker* _parker; | |
| 1627 public: | |
| 1628 Parker* parker() { return _parker; } | |
| 1629 | |
| 1630 // Biased locking support | |
| 1631 private: | |
| 1632 GrowableArray<MonitorInfo*>* _cached_monitor_info; | |
| 1633 public: | |
| 1634 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } | |
| 1635 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } | |
| 1636 | |
| 1637 // clearing/querying jni attach status | |
| 1638 bool is_attaching() const { return _is_attaching; } | |
| 1639 void set_attached() { _is_attaching = false; OrderAccess::fence(); } | |
| 342 | 1640 private: |
| 1641 // This field is used to determine if a thread has claimed | |
| 1642 // a par_id: it is -1 if the thread has not claimed a par_id; | |
| 1643 // otherwise its value is the par_id that has been claimed. | |
| 1644 int _claimed_par_id; | |
| 1645 public: | |
| 1646 int get_claimed_par_id() { return _claimed_par_id; } | |
| 1647 void set_claimed_par_id(int id) { _claimed_par_id = id;} | |
| 0 | 1648 }; |
| 1649 | |
| 1650 // Inline implementation of JavaThread::current | |
| 1651 inline JavaThread* JavaThread::current() { | |
| 1652 Thread* thread = ThreadLocalStorage::thread(); | |
| 1653 assert(thread != NULL && thread->is_Java_thread(), "just checking"); | |
| 1654 return (JavaThread*)thread; | |
| 1655 } | |
| 1656 | |
| 1657 inline CompilerThread* JavaThread::as_CompilerThread() { | |
| 1658 assert(is_Compiler_thread(), "just checking"); | |
| 1659 return (CompilerThread*)this; | |
| 1660 } | |
| 1661 | |
| 1662 inline bool JavaThread::stack_yellow_zone_disabled() { | |
| 1663 return _stack_guard_state == stack_guard_yellow_disabled; | |
| 1664 } | |
| 1665 | |
| 1666 inline bool JavaThread::stack_yellow_zone_enabled() { | |
| 1667 #ifdef ASSERT | |
| 1668 if (os::uses_stack_guard_pages()) { | |
| 1669 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use"); | |
| 1670 } | |
| 1671 #endif | |
| 1672 return _stack_guard_state == stack_guard_enabled; | |
| 1673 } | |
| 1674 | |
| 1675 inline size_t JavaThread::stack_available(address cur_sp) { | |
| 1676 // This code assumes java stacks grow down | |
| 1677 address low_addr; // Limit on the address for deepest stack depth | |
| 1678 if ( _stack_guard_state == stack_guard_unused) { | |
| 1679 low_addr = stack_base() - stack_size(); | |
| 1680 } else { | |
| 1681 low_addr = stack_yellow_zone_base(); | |
| 1682 } | |
| 1683 return cur_sp > low_addr ? cur_sp - low_addr : 0; | |
| 1684 } | |
| 1685 | |
| 1686 // A thread used for Compilation. | |
| 1687 class CompilerThread : public JavaThread { | |
| 1688 friend class VMStructs; | |
| 1689 private: | |
| 1690 CompilerCounters* _counters; | |
| 1691 | |
| 1692 ciEnv* _env; | |
| 1693 CompileLog* _log; | |
| 1694 CompileTask* _task; | |
| 1695 CompileQueue* _queue; | |
| 1584 | 1696 BufferBlob* _buffer_blob; |
| 0 | 1697 |
|
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1698 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper |
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1699 |
| 0 | 1700 public: |
| 1701 | |
| 1702 static CompilerThread* current(); | |
| 1703 | |
| 1704 CompilerThread(CompileQueue* queue, CompilerCounters* counters); | |
| 1705 | |
| 1706 bool is_Compiler_thread() const { return true; } | |
| 1707 // Hide this compiler thread from external view. | |
| 1708 bool is_hidden_from_external_view() const { return true; } | |
| 1709 | |
| 1710 CompileQueue* queue() { return _queue; } | |
| 1711 CompilerCounters* counters() { return _counters; } | |
| 1712 | |
| 1713 // Get/set the thread's compilation environment. | |
| 1714 ciEnv* env() { return _env; } | |
| 1715 void set_env(ciEnv* env) { _env = env; } | |
| 1716 | |
| 1584 | 1717 BufferBlob* get_buffer_blob() { return _buffer_blob; } |
| 1718 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; }; | |
| 1719 | |
| 0 | 1720 // Get/set the thread's logging information |
| 1721 CompileLog* log() { return _log; } | |
| 1722 void init_log(CompileLog* log) { | |
| 1723 // Set once, for good. | |
| 1724 assert(_log == NULL, "set only once"); | |
| 1725 _log = log; | |
| 1726 } | |
| 1727 | |
|
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1728 // GC support |
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1729 // Apply "f->do_oop" to all root oops in "this". |
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1730 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames |
|
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1731 void oops_do(OopClosure* f, CodeBlobClosure* cf); |
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1732 |
| 0 | 1733 #ifndef PRODUCT |
| 1734 private: | |
| 1735 IdealGraphPrinter *_ideal_graph_printer; | |
| 1736 public: | |
| 1737 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } | |
| 1738 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } | |
| 1739 #endif | |
| 1740 | |
| 1741 // Get/set the thread's current task | |
| 1742 CompileTask* task() { return _task; } | |
| 1743 void set_task(CompileTask* task) { _task = task; } | |
|
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1744 |
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1745 // Track the nmethod currently being scanned by the sweeper |
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1746 void set_scanned_nmethod(nmethod* nm) { |
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1747 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value"); |
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1748 _scanned_nmethod = nm; |
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|
1749 } |
| 0 | 1750 }; |
| 1751 | |
| 1752 inline CompilerThread* CompilerThread::current() { | |
| 1753 return JavaThread::current()->as_CompilerThread(); | |
| 1754 } | |
| 1755 | |
| 1756 | |
| 1757 // The active thread queue. It also keeps track of the current used | |
| 1758 // thread priorities. | |
| 1759 class Threads: AllStatic { | |
| 1760 friend class VMStructs; | |
| 1761 private: | |
| 1762 static JavaThread* _thread_list; | |
| 1763 static int _number_of_threads; | |
| 1764 static int _number_of_non_daemon_threads; | |
| 1765 static int _return_code; | |
| 1766 | |
| 1767 public: | |
| 1768 // Thread management | |
| 1769 // force_daemon is a concession to JNI, where we may need to add a | |
| 1770 // thread to the thread list before allocating its thread object | |
| 1771 static void add(JavaThread* p, bool force_daemon = false); | |
| 1772 static void remove(JavaThread* p); | |
| 1773 static bool includes(JavaThread* p); | |
| 1774 static JavaThread* first() { return _thread_list; } | |
| 1775 static void threads_do(ThreadClosure* tc); | |
| 1776 | |
| 1777 // Initializes the vm and creates the vm thread | |
| 1778 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); | |
| 1779 static void convert_vm_init_libraries_to_agents(); | |
| 1780 static void create_vm_init_libraries(); | |
| 1781 static void create_vm_init_agents(); | |
| 1782 static void shutdown_vm_agents(); | |
| 1783 static bool destroy_vm(); | |
| 1784 // Supported VM versions via JNI | |
| 1785 // Includes JNI_VERSION_1_1 | |
| 1786 static jboolean is_supported_jni_version_including_1_1(jint version); | |
| 1787 // Does not include JNI_VERSION_1_1 | |
| 1788 static jboolean is_supported_jni_version(jint version); | |
| 1789 | |
| 1790 // Garbage collection | |
| 1791 static void follow_other_roots(void f(oop*)); | |
| 1792 | |
| 1793 // Apply "f->do_oop" to all root oops in all threads. | |
| 1794 // This version may only be called by sequential code. | |
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1795 static void oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1796 // This version may be called by sequential or parallel code. |
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1797 static void possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1798 // This creates a list of GCTasks, one per thread. |
| 1799 static void create_thread_roots_tasks(GCTaskQueue* q); | |
| 1800 // This creates a list of GCTasks, one per thread, for marking objects. | |
| 1801 static void create_thread_roots_marking_tasks(GCTaskQueue* q); | |
| 1802 | |
| 1803 // Apply "f->do_oop" to roots in all threads that | |
| 1804 // are part of compiled frames | |
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1805 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1806 |
| 1807 static void convert_hcode_pointers(); | |
| 1808 static void restore_hcode_pointers(); | |
| 1809 | |
| 1810 // Sweeper | |
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1811 static void nmethods_do(CodeBlobClosure* cf); |
| 0 | 1812 |
| 1813 static void gc_epilogue(); | |
| 1814 static void gc_prologue(); | |
| 1815 | |
| 1816 // Verification | |
| 1817 static void verify(); | |
| 1818 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); | |
| 1819 static void print(bool print_stacks, bool internal_format) { | |
| 1820 // this function is only used by debug.cpp | |
| 1821 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); | |
| 1822 } | |
| 1823 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); | |
| 1824 | |
| 1825 // Get Java threads that are waiting to enter a monitor. If doLock | |
| 1826 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
| 1827 // VM needs to be at a safepoint. | |
| 1828 static GrowableArray<JavaThread*>* get_pending_threads(int count, | |
| 1829 address monitor, bool doLock); | |
| 1830 | |
| 1831 // Get owning Java thread from the monitor's owner field. If doLock | |
| 1832 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
| 1833 // VM needs to be at a safepoint. | |
| 1834 static JavaThread *owning_thread_from_monitor_owner(address owner, | |
| 1835 bool doLock); | |
| 1836 | |
| 1837 // Number of threads on the active threads list | |
| 1838 static int number_of_threads() { return _number_of_threads; } | |
| 1839 // Number of non-daemon threads on the active threads list | |
| 1840 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } | |
| 1841 | |
| 1842 // Deoptimizes all frames tied to marked nmethods | |
| 1843 static void deoptimized_wrt_marked_nmethods(); | |
| 1844 | |
| 1845 }; | |
| 1846 | |
| 1847 | |
| 1848 // Thread iterator | |
| 1849 class ThreadClosure: public StackObj { | |
| 1850 public: | |
| 1851 virtual void do_thread(Thread* thread) = 0; | |
| 1852 }; | |
| 1853 | |
| 1854 class SignalHandlerMark: public StackObj { | |
| 1855 private: | |
| 1856 Thread* _thread; | |
| 1857 public: | |
| 1858 SignalHandlerMark(Thread* t) { | |
| 1859 _thread = t; | |
| 1860 if (_thread) _thread->enter_signal_handler(); | |
| 1861 } | |
| 1862 ~SignalHandlerMark() { | |
| 1863 if (_thread) _thread->leave_signal_handler(); | |
| 1864 _thread = NULL; | |
| 1865 } | |
| 1866 }; | |
| 1867 | |
| 1972 | 1868 |
| 1869 #endif // SHARE_VM_RUNTIME_THREAD_HPP |